| Character | Description |
| ! | Indicates a receipt of a reply. |
| . | Indicates the request has timed out while waiting for a reply. |
| ? | Unknown error. |
| @ | Unreachable for unknown reason. |
| A | Administratively unreachable. Usually means that an access control list (ACL) is blocking traffic. |
| B | Packet too big. |
| H | Host unreachable. |
| N | Network unreachable (beyond scope). |
| P | Port unreachable. |
| R | Parameter problem. |
| T | Time exceeded. |
| U | No route to host. |
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